Finding the Third Proportional to 359,640 and 558,778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   359,640 : 558,778.50 = 558,778.50 : x
2. Step 2: Convert to fraction form
   359,640/558,778.50 = 558,778.50/x
3. Step 3: Cross multiply
   359,640x = 558,778.50 × 558,778.50
4. Step 4: Simplify right side
   359,640x = 312,233,412,062.25
5. Step 5: Solve for x
   x = 312,233,412,062.25/359,640
6. Step 6: Final answer
   x = 868,183.22